tallman



(Model.) 2 Sheets-Sheet 1.

G. W. TALLMAN. Looking Latch.

No. 238,729. atented Marchf8,-1881.

N, PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, D C.

(Model.) 2 Sheets-Sheet 2.

G. W. TA-LLMAN. Looking Latch. NQ. 238,729. Patented March 8, |881.

N. FEYERS, vHOTo-LITMOGHAPHER, WASHINGTON D C l Uni'rnn STATES 'PATENTOFFICE..

GEORGE W. TALLMAN, OF NEV YORK, N. Y.

LOCKING-LATCH.

SPECIFICATION forming part of Letters Patent No. 238,729, dated March 8,1881.

Application tiled October 28, 1880. (Model.)

To all whom t may concern Be it known that I, GEORGE W. TALLMAN, acitizen of the United States, residing at New York, in the county of NewYork and State of New York, have invented certain new and usefulImprovements in Locks; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspecification.

The present invention relates to that class of knob-latches orlatch-locks which are provided with means for connecting the knobspindlewith the bolt for the purpose of enabling the latter to be operated fromthe outside and inside ofthe door in the manner of an ordinaryknob-latch, the mechanism being' constructed so that said spindle can bedisconnected from the bolt for the purpose of preventing the latter frombeing operated from the outside of the door unless the spindle is iirstconnected with the bolt by means of a key inserted into the outsideknob, the connection of the bolt with the spindle from the inside beingeffected by a device extending through the inside knob.

The invention consists in a novel construction and combination of parts,which will be hereinafter more fully described, and then set forth inthe claims.

In the drawings, Figure l is a vertical section through center ofknob-spindle. Fig. 2 is a horizontal section of the lock, taken throughthe center of the knob-spindle. Fig. 3 is an enlarged cross-sectionthrough the knob-spindle on the line y y, the relative position of thespindle being that shown by Fig. l. Fig. 4 is a side elevation of thelock, taken on the line x x of Fig. 1, the side of the case beingremoved.

The lock or bolt case A, of a rectangular or other shape, is providedwith a detachable face-plate, B, and with an end opening, c, throughwhich the bolt O is projected int-o its receiving mortise or strike onthe door-frame.

The bolt G is constructed with a yoke, D, having a guide-stem, E,extending through the rear end of the casing A. This stem is encircledbya spiral spring, F, which serves to project the bolt from the lock orlatch casing.

The knob-spindle G is constructed with acentral enlarged portion or hub,H, which tits into the yoke D, the opening in the latter being of such asize and shape as to receive said hub and permit the proper rotation ofthe latter. The spindle G extends through suitable rosettes or plates I,attached to the outer faces of the casing, and has knobs J K applied toits ends for the purpose of operating the same. The spindle is madehollow, or has axial openings formed therein, which extend from theouter ends of said spindle to the hub or enlarged central portion, H.These openin gs are made of an angular shape, and are designed for thereception of a push-rod, L, on the inside of the door, and akey,M,inserted through the outside knob. lhe outer end of the spindle has acap-plate, N, the opening in which is arranged at right angles to thebore of the spindle, but is in line with the opening in the outsideknob. The key M and push-rod Lare both formed with a nose or beveledend, m, and the key M has a series of nibs, a, which, when the key isijrst insertedinto theknob-spindle, t into wards g, arranged at thesides of the aperture or bore in said spindle. rlhe object of theinterior wards of the knob-spindle and the capplate on the outer end ofsaid spindle is to prevent the insertion of any tool or implement intothe knob-spindle except the proper key having nibs registering with orpassing between the wards of the spindle. It will be perceived that thekey, after having been passed through the outer knob and cap-plate ofthe spindle, is turned so as to engage with or pass between the wardsofsaid spindle. rI-he key can then be pushed forward, so that its nosewill engage with the devices forming the connection with thelatch-bolt.The hub portion His constructed with a square or angular vertical recessor socket, which receives a sliding block or tumbler.

The block O is acted upon by the key or push-rod inserted through theproper knob, and is provided with extensions or noses O', which iit intothe aperture of the spindle, so much of said bore as receives theextensions or noses O being made open or slotted at the top,

IOO

so as to enable the upper sides of said noses to be projected or raisedHush with the surface of the spindle. The extensions or noses O arebeveled on their Linder sides, so as to permit the beveled end of thekey M or push-rod Lto engage therewith and raise the block O. rIbisblock, when projected above the surface of the hub portion H by means ofthe key M or push-rod L, is caused to engage with square openings orsockets P, made in the yoke D. When the parts are in this position thespindle is turned by means of either knob, causing the block O to movethe bolt or rather the yoke, and when the bolt is fully retracted intothe bolt-casing the block O will ll the opening in the yoke. When thekey or push-rod is disengaged from the nose of the block 0 the latter iswithdrawn into the hub and disconnected t'rom the yoke of the bolt bymeans of a spiral or other spring, It, located within said block. Thesides ot' the latter are slotted, as shown at 04, so as to move on atransverse guide-pin, o5, arranged inside the hub H. rllhe block has acentral opening extending from the top down past the side slots 04nearly to the bottom ot' the block, and the spring R is placed at thebottom of this central opening beneath the guide-pin 05, against whichit presses. rIhe push-pin L has a button, u, at its outer end, and along angular shank, u2, which slides in the correspondinglyshaped boreot' the spindle. The shank u2 has Vthe beveled inner end or nose, m,before referred to.

1t will readily be perceived that when the block or tumbler isdisengaged from the yoke of the bolt the spindle will, when rotated,play loosely in the yoke and not operate the same.

For the purpose of preventing the bolt from. being moved from theoutside ot the door by means ofthe key, I provide a simple lockingdevice consisting of a pin, WV, having a milled head, X, and ascrew-threaded outer portion, which moves in a threaded guide socket ortube, Y, on the inside face-plate of the lockcasing. This pin, whenprojected into the lock-casing, enters a seat, Q, in the front end ofthe yoke D, and thus serves to lock the bolt.

I am aware that a latch-bolt has been made which is projected into thedoor-casing by a spring, and retracted therefrom by means of push-stemsprovided with triangular or beveled plates, which engage with afriction-roller of the latch-bolt.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a knob-latch or latch-lock, the combination ot' a hollowknob-spindle having a central socketed hub and a block or tumblersliding therein, and the yoke of the bolt encompassing said hub andprovided with apertures, with an outside knob adapted for the receptionot' a suitable key, and au inside knob provided with a push-pin,substantially as and for the purpose set forth.

2. In a knob-latch, the knob-spindle having an angular bore containinglateral wards and a cap-plate provided with an opening arrangedtransversely to the opening in the spindle, and a mortised hub orcentral portion containing a sliding block or tumbler, in combinationwith an apertured knob, a suitably-nibbed key, and a latch-bolt, adaptedfor engagement with the block in the spindle, substantially as and forthe purpose set forth.

3. In a knob-latch, the combination of a knob-spindle having a centralsocket, a springretracted block or tumbler tted in said socket, audhaving beveled extensions, and a latch or locking bolt adapted to engagewith the block or tumbler, substantially as and for the purpose setforth.

ln testimony whereof` I afiix my signature in presence of two witnesses.

yGEORGE WV. TALLMAN. Witnesses:

FREDERICK G. SUTTON, Jos. H. SEVERANCE.

